The main constituent of biogas is
A
Butane
B
Methane
C
Hydrogen Sulphide
D
Carbondioxide
Correct Answer: Methane
The main constituent of biogas is methane (55-70%), CO2 (30-45%) and some traces of gases such as H2S and ammonia.
Biogas is produced under anaerobic conditions; the process is denominated as anaerobic digestion.